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A piece of rigging hardware specifically for adjusting the length or tension of a line. The appropriateness of their use with dynamic loads is debated. Once a standard part of all counterweight rigging systems' linesets to level battens, many companies today will no longer supply them for that purpose.

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Rigging Accessories

Further subdivided by type of attachment. The above, from top to bottom are: hook-hook, jaw-jaw, and hook-eye. Hook type have no place in stage rigging. As to the other two, see this thread for discussion: https://www.controlbooth.com/threads/turnbuckle-style.40175/ .